title: Evolution of a protochordate allorecognition locus.
mesh_terms: D000483:Alleles; D000818:Animals; D005075:Biological Evolution; D003001:Cloning, Molecular; D003433:Crosses, Genetic; D006579:Heterozygote; D006720:Homozygote; D007125:Immunogenetics; D011110:Polymorphism, Genetic; D014561:Urochordata / Q000235:genetics* / Q000254:growth & development / Q000276:immunology